TW200523111A - Tear resistant peelable seal for containers - Google Patents

Tear resistant peelable seal for containers Download PDF

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Publication number
TW200523111A
TW200523111A TW93132514A TW93132514A TW200523111A TW 200523111 A TW200523111 A TW 200523111A TW 93132514 A TW93132514 A TW 93132514A TW 93132514 A TW93132514 A TW 93132514A TW 200523111 A TW200523111 A TW 200523111A
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TW
Taiwan
Prior art keywords
layer
polymer
sealing structure
scope
item
Prior art date
Application number
TW93132514A
Other languages
Chinese (zh)
Other versions
TWI361754B (en
Inventor
Steven R Cosentino
Stephen K Franzyshen
Original Assignee
Dupont Teijin Films Us Ltd
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Filing date
Publication date
Priority to US10/714,144 priority Critical patent/US7012032B2/en
Application filed by Dupont Teijin Films Us Ltd filed Critical Dupont Teijin Films Us Ltd
Publication of TW200523111A publication Critical patent/TW200523111A/en
Application granted granted Critical
Publication of TWI361754B publication Critical patent/TWI361754B/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04Interconnection of layers
    • B32B7/12Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/12Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/36Layered products comprising a layer of synthetic resin comprising polyesters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04Interconnection of layers
    • B32B7/10Interconnection of layers at least one layer having inter-reactive properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2272/00Resin or rubber layer comprising scrap, waste or recycling material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/50Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514Oriented
    • B32B2307/518Oriented bi-axially
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/50Properties of the layers or laminate having particular mechanical properties
    • B32B2307/582Tearability
    • B32B2307/5825Tear resistant
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2367/00Polyesters, e.g. PET, i.e. polyethylene terephthalate
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2581/00Seals; Sealing equipment; Gaskets
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/13Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1355Elemental metal containing [e.g., substrate, foil, film, coating, etc.]
    • Y10T428/1359Three or more layers [continuous layer]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/13Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1362Textile, fabric, cloth, or pile containing [e.g., web, net, woven, knitted, mesh, nonwoven, matted, etc.]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/28Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/31551Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
    • Y10T428/31565Next to polyester [polyethylene terephthalate, etc.]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/31551Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
    • Y10T428/31569Next to natural rubber
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/10Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
    • Y10T442/102Woven scrim
    • Y10T442/109Metal or metal-coated fiber-containing scrim
    • Y10T442/124Including a natural or synthetic rubber layer
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/10Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
    • Y10T442/102Woven scrim
    • Y10T442/109Metal or metal-coated fiber-containing scrim
    • Y10T442/126Including a preformed film, foil, or sheet
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/674Nonwoven fabric with a preformed polymeric film or sheet

Abstract

A tear resistant seal made from a recyclable multilayer structure that consists of an oriented polymer film layer and a thermal bonding polymer layer on the oriented polymer layer inner surface substantially coextensive thereto, and a reinforcing scrim polymer also having an inner surface adjacent and substantially coextensive with the thermal bonding polymer layer. The polymer film layer and the bonding polymer layer are co-extruded layers having a chemical composition that permits recycling without separating the layers. The scrim layer also has a similar chemical composition, permitting recycling following lamination, thereby permitting the recovery of waste material during production runs by the simple recycling of the complete laminated structure.

Description

200523111 15192pif.doc IX. Description of the invention: [Technical field to which the invention belongs] The present invention relates to a sealing structure, and more particularly to a recyclable tear-resistant and peelable seal using a multilayer structure Lid. [Prior art] Generally speaking, a sheet made of multiple layers of material is often used to seal the opening of a container to prevent outside air and pollutants from entering the dwelling. A typical sealing structure includes a thin sheet of metal foil, which is a thin film of a heat sealable material that is used to join the metal foil to the edge of a container, for example, such as It is a plastic tray type food package, a bottle or a biister package. When the sealing structure is to seal a bottle tightly, it seals the edge of the container by heat, wherein the sealing structure is formed by die-cutting a thin plate made of a multi-layer material. When the packaging used for the container is a blister type (package type), it has holes in a large sheet. The sealing structure is usually presented in the following manner, for example, it is extended by a sheet to cover the opening of the blister type package or an array formed by covering these blister types. Plastic food trays (con_ trays) contain metal because they often need to be cooked or heated. The thickness of this food Rongwei in the sealed structure is thicker than the thickness of the traditional Lion packaging. The blister packaging has a top edge (top hp). 200523111 15192pif.doc A lid to seal the package. The seal structure, cover, and structure have a label (tat0), which extends from the periphery of the seal structure and shoots outside, so that the contents of this volume H can be used as a dwelling paper, and it can be easily bubble-shaped. In addition, when the seal structure is an edSeW structure, the edges of the structure can have most side marks (scored ~ I). The grip required to remove the seal structure (grip). ^ For the example of package I, this seal The structure can be regarded as the branch of the bubble-shaped bag (that is, the external sealing type), or the sealing mouth-β; a threaded neck and a threaded valley ③ inside (also ㈣ The internal sealing structure Tongwei is formed by die-cutting the multilayer sheets of the metal box described above, wherein the metal foil has a heat sealable material layer. Then, one inner The sealing structure is placed in the lid, and the lid is wisted and fixed on the neck of the container. After that, the covered container is heated to allow heat to be transferred to the aluminum foil to make the heat-sealing material layer Melting, so that the inner bifurcated structure can be bonded to the container. Whether it is used to seal the blister package or the bottle mouth of the container, the sealing structure must still consider the design of tear resistance, including bitting resistance, etc., especially to effectively prevent young children from biting the package, and The bite-resistant design is very important to take or eat its contents arbitrarily. Materials used to make this peelable seal structure include a biaxially oriented polyester film, such as It is covered with an amorphous heat-sealable polyester layer such as Mylar®, etc. The sealing structure may further include a printed indica at 200523111 15192pif.doc

The exposed surface of Mylar® layer. A second heat-sealable polyester layer of Myiar® can be applied over this display. In contrast, a surface with a reverse (j) printed logo on a second My 1 ar® layer can be attached to the upper surface of the sealing structure so that the printed logo can be properly oriented (prOperly 〇riented) and protected by the Mylar® layer. Other common structures include Mylar® RL43, which is covered with a heat activated seal of ethylene vinyl acetate (EVA) as a Peelable seal. According to the above reasons, the sealing structure of the lid must have the characteristics of tearing, especially in the process of peeling. In addition, the sealing structure is waterproof or waterproof vapor or financial heat. The design also needs to be considered, especially when the food in the container needs to be heated, or when it is printed on its exposed surface, or when the manufacturing cost is reduced. In addition, the material of the sealing structure must also be considered Environmental issues in subsequent treatment 0 US Patent No. 5,372,268, invented by Han and transferred to 3M Company, discloses a multilayer structure for heat-sealed structures. The structure includes (a) a layer of sealing material to attach the sealing structure to the container, (b) a film layer that blocks air and water vapor from penetrating, and (c) a reinforcing material layer. The sealing material layer may be composed of any suitable adhesive, such as a heat sealable film, a hot melt adhesive, and a tack-free pressure activated adhesive. ) Or a shear-activated adhesive, etc. This impermeable layer (impermeable 200523111 15192plf.doc layer) may be composed of a polymeric film, such as poly (vinyl chloride) ) Or metal foil (for example, aluminum foil, etc.). This reinforcing layer is a multilayer film including at least two layers of monoaxially oriented films. One of them has a stronger direction. The weak direction of the uniaxially oriented film on the other layer is formed by intersecting with each other and being laminated together, so that the forces in all directions are consistent with each other. (Machine direction), cross direction (cross direction) to the tear strength in the diagonal direction (diag0nai direction) of (Tear) tension (tesile) can be increased. In this way, the use of dissimilar chemical materials to form a sealed structure, thereby increasing the thickness and stiffness of the final product, has been disclosed in the conventional technology ^. In order to meet the material characteristics required for the above-mentioned sealing structure materials, this method of increasing the number of used multiple material layers will complicate its required process steps, thereby increasing its manufacturing cost. What's more special is that the plutonium waste generated in the manufacturing process and the webs required to form this sealed structure are both a considerable problem in handling. However, in order to produce a lean seal 3 'with high resistance and the secret of waterproof silk, it is necessary to use webs, so the problem is quite order; /, therefore, still need to develop-a kind can be used for sealing ^ Material, so that the lid can have a high degree of resistance = " It can be easily sealed on the lid. 200523111 15192plf.doc [Summary of the invention] The present invention proposes a sealing structure for sealing a container. The sealing structure is composed of a multilayer structure that is resistant to tearing. When used, the sealing structure can effectively prevent puncture or tearing. The sealing structure is cracked. The sealing structure includes: a) an oriented polymer film layer having a top surface and an inner surface; b) a thermal bonding polymer layer, which is essentially Substantially coextensive on the inner surface of the oriented polymer film layer, wherein the heat-bonded polymer layer has a thickness that is a joint between the oriented polymer film layer and one of the heat-bonded polymer layers 10% to 40% of thickness; and c) a reinforcing scrim polymer layer having an inner surface and a bottom surface, wherein the inner surface is substantially coextensive with the thermally bonded polymer layer. According to the sealing structure according to the preferred embodiment of the present invention, the oriented polymer film layer and the heat-bonded polymer layer are co-extruded layers, which have a chemical composition that allows the film layer Reusable without separation. The reinforced polymer layer also has a similar chemical composition ' and its subsequent following lamination can be reused. When this complete laminated structure is reused, the selection of these materials will allow the recovery of waste material. In the present invention, the so-called "recycling" refers to the ability to reuse 200523111 15192pif.doc (reuse) materials under the same or similar processes. The “recycling capacity” means that when this recycled material is used, the weight of the recyclable material accounts for 20% to 70% of the weight of the entire finished product. For example, the polyester waste generated in the production operation can be shredded and then recycled into a plurality of recycled pallets by a ballizing extruder Reuse. These recycled polyester pellets can be blended with fresh or virgin polyester polymers (p〇iyester p〇iymer), and these Re-melted and re-extruded materials will make oriented films or other products. A thermally activated adhesive layer can cover the bottom surface of the reinforced composite layer to provide the adhesion required for the sealed structure to be attached to the opening of a container. The sealing structure according to a preferred embodiment of the present invention, wherein the thermally-bonded polymer layer and the reinforced polymer layer respectively include a synthetic condensation polymer, wherein each synthetic concentrated λK compound includes a polycondensation polymer. A polymerized form, for example: a) —carboxylic acid or a mixture of monocarboxylic acids, and diamine or a mixture of diamines, or fluorinated alcohol Or a mixture of alcohols, or amino acids, which have more than 2 carbon atoms, or a mixture of amino acids, etc., where one of these polymers all constitutes this synthesis In agricultural shrink polymers, these polymers include: 11 200523111 15l92pif.doc (1) at least 90 mol% of carboxylic acid or a combination of this synthetic concentrated polymer and carb oxy 1 ic acid The total amount is the same carboxylic acid; (2) At least 90 mol% of diamine or the combined total of the synthetic concentrated polymer and the diamine is the same diamine; ( 3) At least 90 mol% of diols or the total combined amount of the synthetic concentrated polymer and diols mixture is the same; (4) At least 90 mol% of amino acids or this The total combined amount of the synthetic concentrated polymer and the amino acid mixture is the same amino acid; the oriented polymer film layer may include biaxially oriented polyethylene terephthalate (PET). According to the sealing structure of the preferred embodiment of the present invention, a thermally activated adhesive layer can be used to arrange the bottom surface of the reinforced polymer layer at the opening of a container, such as a bottle mouth or a bubble. The top side, open side, etc. of the packaging are shaped so that the sealed structure can be peeled from the container at any time. In order to make the above and other objects, features, and advantages of the present invention more comprehensible, preferred embodiments are described below in detail with reference to the accompanying drawings, as follows. [Embodiment] The following is a preferred embodiment of the present invention, which is described in conjunction with a plurality of schematic diagrams, wherein the same reference numerals in each diagram represent the same features. These diagrams are only for the convenience of explaining and explaining the present invention. Therefore, the 20052005111111 15l92plf.doc is not an engineering drawing used in the actual process, and is not enlarged according to the actual process scale. In addition, the present invention can be understood by showing some elements partially or not in the schematic diagram of the present invention. FIG. 1 is a schematic cross-sectional view of a multilayer sealing structure according to a preferred embodiment of the present invention. Please refer to Figure i. This sealing structure contains at least three layers. As for the additional film layer may be located above or below the three film layers, in this embodiment, as long as the three film layers can explain the present invention, these additional film layers are not shown in this embodiment. In the schematic. The three film layers are the tear-resistant parts of the sealing structure, which are a top layer 12, a bonded polymer layer 18, and a reinforced scrim layer 20, respectively. The top layer 12 is an oriented polymer film (oriente (jp〇imerfiim)), which is composed of a linear polyester (linear polyester). Generally, the viscosity of this linear polyester is between 0.5 and 5 0.8, the common one is 0.6. Among them, the preferred polyethylene film includes biaxially oriented (biaxiaiiy orientecj) polyethylene terephthalate (PET) film and biaxially oriented Polyethylene naphthalate (PEN) film. When polyethylene terephthalate (PET) is biaxially oriented and heat set, Has become very useful, as such polyethylene terephthalate (PET) materials have been fully disclosed in the art (for example, US Patent No. 4,375,494). As for this polyethylene terephthalate (PET) The polymer manufacturing process has been disclosed in conventional techniques and many literatures, such as the "Encydopepedia of Polymer Science" published by Willy Press, New York, 13 200523111 15192plf.doc (Wiley). and Engineering) "(2nd Ed.) Vol. 12 (Vol. 12), page 1 to page 313. This polymer can be condensed by appropriate dicarboxylic acid or alkyl diester and ethylene diethylene glycol. Alcohol (ethylene glycol). Polyethylene terephthalate (PET) can be made of terephthalic acid (terephthalic acid) or terephthalate (ester). Polyethylene terephthalate Diethylene naphthalate (PEN) can be made of 2, dicarboxylic acid or 2,7- dicarboxylic acid ester. The oriented polymer film of the top layer 12 can contain a tiny additive, In order to improve the appearance of the product or change the permeability of the composite paperboard structure to water vapor or other gases. In a preferred embodiment of the present invention, a micro additive is included. ) The film layer is a pair of car-oriented polyethylene terephthalate (PET) 'It includes about 15% of dioxin, this polymer is called Mylar® in the market 365T, by Dupont Teijin Films of Wilmington, D Manufactured by E · company. The other polymer is Melinex® 389, which contains a UV absorber. In a preferred embodiment, the type of other minute additives is, for example, a flame retardant additive, which includes ciay, talc, and silica. Because the amount of these additives used is very small, the waste product left during the manufacture of this polymer can be recycled. 200523111 15192pif.doc The oriented polymer film of the top layer 12 has a top surface 14 and an inner surface 16. Adhered to the inner surface 16 is a thermal bonding polymer layer 18. The thermal bonding polymer layer 18 can form an adhesive bond between the oriented top layer 12 and a strengthened polymer layer 20. Briefly, the thermally-bonded polymer layer 18 is formed on the surface of the inner surface 16 (wherein the inner surface 16 is a directional polymer layer) to form a film composite. Then, the thermally bonded polymer layer 18 can be softened by applying pressure and temperature to the thermally bonded polymer layer 18 so that the composite can strengthen the scrim polymer layer 20, where the applied Temperature or pressure will not soften or melt this inner surface 16 or polymer layer 20. The thermally-bonded polymer layer 18 may include a polyester resin, especially a copolyester resin, which is composed of one or more dibasic aromatic carboxylic acids. ), Such as terephthalic acid, isophthalic acid, and hexahydroterephthalic acid, or one or more alcohols, such as Ethylene glycol, ethylene glycol, diethylene glycol, triethylene glycol, neopentyl glycol, etc. The thermally bonded polymer layer 18 may include a pair of terephthalate polyester. A preferred co polyester structure is composed of terephthalic acid, one or two iSOphthalic acid, hexahydroterephthalic acid, and one or more Alcohols (especially 15 200523111 15192pif.doc ethylene glycol). In a preferred embodiment, the copolyester structure in an amorphous state can provide better ethylene terephthalate and ethylene isophthalate. Bonding properties, especially when the molar ratios to ethylene terephthalate are 60 mol% to 90 mol% and the molar ratio of ethylene isophthalate is 40 mol. / 〇 to 10mol%. In a preferred embodiment, the co polyester structure may include 70 mol% to 85 mol% of ethylene terephthalate and 30 mol% to 15 mol% of ethylene isophthalate. For example, the co polyester structure may include 82 mol% ethylene terephthalate and 18 mol% ethylene isophthalate. The sealing structure manufactured according to the preferred embodiment of the present invention can provide an oriented top layer 12 and a thermally bonded polymer layer 18 at the same time to form a preferred thickness of the composite material layer. The thickness ranges from 0.20 mill to 3 mill. (Milli-inches), and a more preferable thickness is 0.50 to 1.4 millimeters. In a preferred embodiment of the present invention, the oriented top layer 12 is a biaxially oriented polyethylene terephthalate (PET) ′ and the thermally bonded polymer layer 18 is as described above. Co polyester resin. The film composite can be conveniently formed by a die having a plurality of orifices to perform a multiple extrusion process. Or, as mentioned in U.S. Patent No. 3,871,947, the molecular orientation of one or more directions 16 200523111 15192 pif.doc (molecular orientation) is extended and heat set to coextrusion of these composite material layers (CO extrusion) process, and it is generally easier to carry out this co extrusion and the equipment needed for it is a single channel co-extrusion process, which is disclosed in US Patent No. 4,165 , No. 210. The method includes simultaneously extruding first and second polyester strips from two different extruders, and arranging the first and second polyester strips in united — Into the tube and into a manifold of a leading-extrusion die, and streamline the two polyester strips through the extrusion die in a streamlined manner As a result, the two polyester strips will not be intermixed with each other to complete the production of the film composite. The biaxially oriented polyethylene terephthalate (PET) is oriented by the polymer layer of the composite material film, and can be continuously operated at a temperature range of 78 QC to 125 ° C. This composite material is stretched in two mutually perpendicular directions to complete. In general, such conditions for stretching polymers can partially crystallize this thermally bonded polymer layer. In some cases, under the dimension restraint, when the temperature is higher than the crystalline melting temperature of the thermally bonded polymer layer, but lower than the polymer oriented by the polymer layer At the crystalline melting temperature of ethyl terephthalate (PET), the effect of heat setting the composite film is better. Then, when the oriented polymer film layer has high crystallinity, the composite can be cooled to form an amorphous thermally-bonded polymer layer at 1720052. Therefore, under the dimension restraint, this heatsetting

The subsequent stretching operation is preferably performed at a temperature ranging from 150 ° C to 250oC. The simpler stretching and heat setting processes are disclosed in US Patent No. 107,139. Therefore, in a preferred embodiment of the present invention, the tear-resistant seal structure, or the lid structure, includes a film composite, which is produced by a coextrusion process. It is formed so that it can contain two layers of different materials, but appears as a thin film. As for the film composite formed by the co extrusion process, it can be divided into the following categories, for example, Melinex® 301H manufactured by Dupont Teijin Films of Wilmington, DE. An oriented polymer top layer 12 is formed with a thermally bonded polymer layer 18. The composite material layer described above can be laminated to form a reinforced scrim layer 20. As for the material type of the reinforced polymer layer 20, it may be a woven or non-woven fiber material, which includes polyester. A non-woven scrim is, for example, a spun bonded polyester product, which is made by the BBA Filtration method of the BBA division of the Nashville, TN company. Named StarWeb®2253C, the basic weight of this polyester product is approximately 18 g / m2 and the thickness is 0.0038 inches. In addition, another non-woven scrim is also made by BB A Filtration. Its name is 18 200523111 15192pif.doc is Reemay ^ OCH's spun bonded Polyester. Has a basis weight of about 14 g / m2. The basis weight of the non-woven scrim used in the present invention ranges from 5 g / m2 to 100 g / m2, and falls from 10 g / m2 to 20 g / m2. The range is better. In addition, especially when higher tension levels and / or high tear strength are required, a woven cloth (3014111) (for example, two-dimensional or three-dimensional) (Type 1- (1 ^ 1 ^ 1 ^ 011 & 1)), its basic weight range is between bg / m2 to 300g / m2. This woven cloth can be made of any different polyester (polyester ), Including but not limited to polyethylene terephthalate (PET) and polyethylene naphthalate (PEN). Figure 2 A schematic diagram of a preferred embodiment of the invention for attaching a sealing structure to a blister pack. Please refer to FIG. 2. The underside of the torn sealing structure is attached—to accommodate a product 21 Blister type package 22. This blister type container is detachably attached to the bottom surface 17 of the polymer layer 20 through an adhesive layer 24. Adhesion Layer 24 may be a solvent-borne EVA solution, ranging from 2gr / m2 to 25gr The weight range between / m2 covers the bottom surface 17 of the polymer layer 20 (scrim layer). The preferred weight range is between 6 gr / m2 and 16 gr / m2. So far, the covering process is continued. It is preferable to perform the lamination of the polymer on a co-extruded composite oriented by a film and a heat-bonding layer 19 200523111 15192pif.doc (co-extruded). In addition, it is also possible to use a For soluble borne polyester or an aqueous adhesive, such as acrylic, EVA or polyester, etc. In contrast, the adhesive layer 24 can also be extruded. The bottom surface of the polymer layer 17. The adhesive can also be applied to the exposed surface 26 of the container, and the exposed surface 26 can be in contact with the sealing structure 10. The adhesive can also be applied by The printing method of a plurality of regions is used as a continuous layer. The printing method is, for example, arranging thin particles of the adhesive around the lid of the blister package 22. Or placed on the underside of this scrim layer on. Generally, the adhesive is a heat-activated adhesive, or a contact adhesive. Equipment commonly used in sealed blister packs or bottle packaging often includes equipment manufactured by KlOckner Medipak, Inc. in the Clearwater area of Florida. FIG. 3 is a schematic diagram of a sealing structure attached to a bottle-shaped container according to a preferred embodiment of the present invention. Please refer to FIG. 3. In this embodiment, the sealing structure is used to seal a mouth of a bottle type container 27. For example, the container can hold tablets (piU) or capsules. In this embodiment, the sealing structure is cut from a large sheet of sealing material into an appropriate shape and size, and is coated on the bottom side opposite to the bottle mouth using an adhesive 24 '( un (jerside) and attach the sealing structure to the mouth of the bottle. In terms of blister package 20 200523111 15192pif.doc, the sealing structure includes, for example, a continuous layer or an adhesive layer ( adhesive layer) to cover the upper surface of the bottle mouth. In addition, in order to facilitate the removal of the sealing structure from the bottle mouth, the sealing structure may further include a small protruding tab 33. The top surface 14 may include, for example, The printed indicia 23 shown in FIG. 3 is, for example, a logo, images, or instructions. Therefore, the top layer 12 may have better printability characteristics. In order to improve the ink retention characteristics of polyethylene terephthalate (PET), a film composite of polyethylene terephthalate (polyethylene terephthalate) One side of a terephthalate (PET) film can be selectively covered with an in-line gravure coater and a primer material to improve the water base. -based and solvent_based coating and adhesion, so it can be easily printed on the surface of this film. This printing primers Including dispersions of aqueous polymers commonly known in the art, or emulsions of acrylic, urethane, polyester, or other resins ) Or solvent, etc. In a preferred embodiment, the coating comprises, for example, at least one sulfopolyester amine acrylate, at least one terablock copolymer resin ), At least one acrylamide / acrylic acid copolymer or its salts are disclosed in US Patent No. 5,985,437, the inventor of which is Chappell. In actual application of 21 200523111 15192plf.doc, the E. I. Dupont de Nemours machine produced by Wilmington, De can be used to print this primer polyester film, called Mylar® 854. Depending on the desired effect of the sealing structure, an additional coating or film can also be applied to the top surface 14. For example, the coating or coating film may include a barrier layer that blocks air and water vapor, such as a film deposited by vacuum deposition or a polymer barrier coating, wherein the polymer barrier coating The barrier coating contains a resin, such as Saran® (a resin of polyvinylidene fluoride (PVdC)) manufactured by Dow Chemical Co., or polyvinyl alcohol (PVA) as a gas barrier layer. -Vinyl alcohol copolymer (EVOH) and oxidized stone (SiOx). These can be coated by means of an aqueous process, a non-aqueous solvent based process, or a solventless process such as coin plating, etc. Film layer. In addition, the sealing structure may further include a plurality of special-purpose film layers, such as a film layer of a special guarantee type, including anti-microbial layers, security, anti-counterfeiting, and trademark protection designs, such as Holographic images, chemical dyeing and marking, luminescent photochemical coatings, etc. In a preferred embodiment shown in FIG. 4, the sealing structure 30 may further include a second combined film / bonding layer 32, which includes a bonding layer 18 and an alignment film layer 12, In order to increase the tear resistance of the sealing structure 30. Next, the second bonding film layer 32 is laminated on the bottom surface of the strengthened scrim layer 20. In addition to this 22 200523111 15192pif.doc, since the second bonding film layer 32 may have a chemical composition (composition), the completed sealing structure 30 can be reused without separating the film layers. In addition, an adhesive layer (not shown) can also cover the exposed surface 34 of the second bonding film layer 32. As for the composition and application method of the adhesive layer, it is the same as that described in the embodiment of FIG. 2 , So I will not go into details here. Although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Anyone skilled in the art can make some modifications and retouching within the spirit and scope of the present invention. The scope of protection of the invention shall be determined by the scope of the attached patent application. [Brief Description of the Drawings] FIG. 1 is a schematic cross-sectional view of a multilayer sealing structure according to a preferred embodiment of the present invention. FIG. 2 is a schematic diagram illustrating a sealing structure attached to a blister pack according to a preferred embodiment of the present invention. FIG. 3 is a schematic diagram of a sealing structure attached to a bottle-shaped container according to a preferred embodiment of the present invention. FIG. 4 is a schematic diagram of a sealing structure according to a preferred embodiment of the present invention, which includes a selective additional layer (optinal “xianyu” layer). [Description of main component symbols] 10: Seal structure 12: Top layer 12 '· Orientation film layer 23 200523111 15192plf.doc 14: Top surface 16: Inner surface 17: Bottom surface 18: Polymer layer 18': Joint layer 20: Polymer layer 21 ·· Product 22: Blister package 23 ·· Printed label 24: Adhesive layer 24 ': Adhesive 26: Exposed surface 27: Bottle-shaped container 30 ·· Seal structure 32: Bonding film layer 33 ·· Label 34 ·· Surface

Claims (1)

15192pif.doc 200523111 10. Scope of patent application: 1. A sealing structure suitable for sealing the opening of a container. The sealing structure includes at least a composite layer of tear resisting, including : An oriented polymer film layer having a top surface and an inner surface; a thermal bonding polymer layer that is substantially coextensively extended to the oriented polymer The inner surface of the film layer, wherein the heat-bonded polymer layer has a thickness that is 10% to 40% of the joint thickness of the oriented polymer film layer and one of the heat-bonded polymer layers; and a reinforcement A polymer layer (reinforcing scrim polymer layer) has an inner surface and a bottom surface, wherein the inner surface is substantially coextensive to the thermally bonded polymer layer, and the tear-resistant composite material layer can provide the seal Structure with better tear resistance. 2. The sealing structure as described in item 1 of the scope of the patent application, wherein the common joint thickness of the oriented polymer film layer and the heat-bonded polymer layer is between 0.00020 inches and 0.003 inches. . 3. The sealing structure according to item 1 of the scope of the patent application, wherein the tear-resistant composite material layer composed of the oriented polymer film layer, the heat-bonded polymer layer and the reinforced polymer layer has a chemical composition It allows the tear-resistant composite material layer to be reused without having to separate its film layer. 4. The sealing structure described in item 3 of the scope of the patent application, further comprising a 25,002,05 mL adhesive layer on the bottom surface of the reinforced polymer layer. 5. The sealing structure according to item 4 of the scope of patent application, wherein the adhesive layer further has a -chemical composition, which allows the tear-resistant composite material layer to be reused without separating its film layer. 6. The sealing structure according to item 4 of the scope of the patent application, wherein the adhesive layer is a thermally activated adhesive layer. 7. The sealing structure according to item 2 of the scope of the patent application, wherein the oriented polymer film layer, the thermally bonded polymer layer, and the reinforced polymer layer in the composite material layer that has only been torn apart each include A synthetic condensation polymer, each of which includes a plurality of polymerized forms, including: a carboxylic acid or a mixture of a carboxylic acid, and a Diamine or a mixture of diamines, or an alcohol or a mixture of alcohols, or an omega-amino acid, having more than 2 carbon atoms, or a mixture of one amino acid, where One of the polymers may be considered as a whole polymer, and the polymers include: at least 90 mol% of the carboxylic acid or the combined total of the carboxylic acid in the synthetic concentrated polymer mixture The amount of the same carboxylic acid, at least 90 mol% of the diamine or the combined amount of the diamine in the synthetic concentrated polymer mixture is the same diamine, at least 90 mol% The alcohols (diols) or the total amount of the alcohols in the synthetic concentrated polymer mixture is the same, and at least 90 mol% of the amino acid or the amino acid of 26 200523111 15192pif.doc The total combined amount of the mixture of synthetic concentrated polymers is the same amino acid. 8. The sealing structure according to item 7 in the scope of the patent application, wherein the directional polymer film layer comprises biaxially oriented polyethylene terephthalate (PET). 9. The sealing structure described in item 7 of the scope of patent application, further comprising a thermally activated adhesive layer disposed on the bottom surface of the reinforced polymer layer. 10. The sealing structure described in item 3 of the scope of patent application, further comprising a blister package attached to the bottom surface of the reinforced polymer layer. 11. The sealing structure according to item 10 of the scope of patent application, wherein the blister package is peelably attached to the reinforced polymer layer by a heat activated adhesive method. On the bottom. 12. The sealing structure according to item η of the scope of patent application, further comprising a blister package attached to the bottom surface of the reinforced polymer layer, wherein the blister package includes a surface and an adhesive The surface is adapted to be attached to the tear-resistant composite material layer, and the adhesive is covered on the surface. 13. The sealing structure according to item 3 of the declared patent scope, wherein at least one of the top surface of the oriented polymer film layer and the inner surface of the oriented polymer film layer includes a printed indica. 14. The sealing structure described in item 3 of the scope of the patent application, wherein the composite material layer that is resistant to 270,200,523mdoc further includes an additional thermal bonding polymer layer and an additional thermal bonding polymer layer. A polymer film layer, wherein the thermally bonded polymer film layer is disposed on the bottom surface of the reinforced polymer layer, and all of the polymer film layers have a chemical compostion, which allows the The polymer film layer can be reused without having to separate its film layer. 15. The sealing structure according to item 3 of the scope of patent application, further comprising a trough with an opening, wherein the sealing structure is releasably attached to and seals the opening of the container. ’Even more to
16 The sealing structure as described in item 3 of the scope of patent application has one special function film layer. 28
TW93132514A 2002-11-20 2004-10-27 Tear resistant peelable seal for containers TWI361754B (en)

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US20040132363A1 (en) 2004-07-08
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